Stamp and drawing press



Jan. 17, 1933. K. STERN ET AL 1,894,713

STAMP AND DRAWING PRESS Filed July 6. 1931 4 Sheets-Sheet 1 1 .nnum "Imam an Jan. 17, 1933. STERN ET AL 1,894,718

STAMP AND DRAWING PRESS Filed July 6, 1931 4 Sheets-Sheet 2 4 Sheets-Sheet 5 K. STERN ET AL .STAMP AND DRAWING PRESS Filed July 6, 19 31 Jam 17,1933.

Jan. 17, 1933. K. STERN ET AL STAMP AND DRAWING PRESS Filed July 6, 1951 4 Sheets-Sheet 4 Patented Jan. 17, 1933 UNITED STATES PATENT OFFICE KARL STERN, OI BADEN NEAR VIENNA, ANDJOSEF KUBIN, OE MOLLERSDORF,

. AUSTRIA; SA-ID KUB'IN ASSIGNOR TO SAID sTERN STAMP AND DRAWING PRESS Application filed July 6; 1931, Serial No. 549,044, and in Austria July 21, 1930.

The known drawing presses for stamping out and drawing container parts or the like of round, cornered or other shztpe in rows from accurately divided up and in some cases printed sheets of metal, cardboard, millb'oard or the like of a definite size are s'o-called special drawing presses (for instance the so-called zig-zag press) and can only operate according to some of the subdivisions of the stamping patterns on the sheet.

In Fig. 1 the stamping circles a of the diameter I), selected by Way of example, are arranged on the sheet metal plate 0 in the row (Z next to one another Without any intermediate space and the stamping circles of the second and following row 6 are arranged with those of the row (Z in mutual contact on lines 7'. In Fig. 2 the row'c is oflset with respect to the row (Z and each row with respect to that preceding'it by theradius, that is by 6/ By this means the distance of the rows (Z and e from one another, which in Fig.

1 is g=b, now becomes equal to 9 which I distance is smaller than 9'. This makes it possible in many cases with a given size of sheet and a given stamping diameter Z) to stamp out one or more additional rows.

For thoroughly utilizing the sheet: metal plates in a really economical manner, that is to say for stamping out as many COIltllllBI parts or the like as possible, according to the size of the sheet metal plates and of the pieces to be stamped and drawn, these may be set out in still other ways. Fig; 3 shows a further example; The row (Z of patterns to be stamped out corresponds to the rows (Zin Figs. 1 and 2s The row 6 is offset with respect to the row (Z not by 5 but by the amount it, which is smaller than 6/ Although in this arrangement the dis tance 9 of the rows (Z and e from one an-.

other, the circles being in contact with one another, is onlyslightly' greater than 9 in Fig; 2, it'is'possible With certain diameters b to place in the offset row e, that is, in each ofthe rows 2, 4, 6 and soon, one more circle a than in Fig. 2. The fact that the dimension 9 is greater than 9', is, however, of no moment, as in most cases this has the only effect that the last row, instead of being at z", is'

moved nearer the edge of the plate to i so that there is only a narrower strip of waste.

Another case is shown in Fig. 4, in which, for instance, the patterns a to be stamped out are distanced from one another in the row (Z by an amount is. The patterns of the row 6 are at a distance Z from those of the row d, which distance is equal to b/ +Zc/ With the circles of the row 6 in contact with those of the row (Z as shown, the distance 9 of the rows (Z and e from one another is smaller than the distance in Fig. 2. In certain circumstances thisenables one or more further rows to be added at the longer edge of the plate, so that the total number of rows is increased. The distance 71' may be made such that either there may be the same number of stampings in the rows (Z and e, as in Fig. 2, or that a loss of say one piece in each row or only in each of the rows 2, 4, 6 and so on in the number of pieces is smaller than the gain due to the addition of one or more rows.

In some circumstances it may be of advantage to have any optional distance between therows (Z, c and so on, and finally to have such a distance inboth directions, for getting a larger number of stampings out of a given sheet metal plate.

It may also be of advantage, for obtaining a greater number of stampings, to follow any number of rows (Z, 6, m, which are offset with respect to one another in any desired way, with any number of rows n, 0 and so on, which are not oliset', as shown in Fig. 5. This arrangement has advantages, where the offset row e contains a smaller number of stampings than the rows which are not offset, which is frequently the case.

How important from the point of view of economy is the method of dividing up accord ing to the invention maybe seen from the'fact that even a difference of one tenth of a millimetre in the dimension g, g g g (the distance apart of the rows) results in certain cases in a' greater number of stampin'g's. In this way an increase in the number of stampings per sheet metal plate up to 16% can be obtained with the ordinary size of plate of approximately 30by 31 inches. Theconse quent, frequently Very considerable, saving in sheet metal plates, printing, colour and stamping work will give some idea of the advantages of the described method of division.

The present invention relates to a stamp or drawing press or an arrangement which can be mounted on or brought into co-operation with any ordinary stamp or drawing press, and which enables the sheet metal plates or the like to be stamped out or moved according to any of the above-described lay-outs, which is not possible with the special machines hitherto known. For the purpose of displacing the successive rows of stamping patterns with respect to one another by any desired amount, a stop bur (longitudinal rail) is rovided for a stop controlled by the machine, so as to be displaceable in both longitudinal directions by this amount which can be changed in each case. This stop bar is interchangeable for allowing for the dimensions b of the patterns to be stamped and their distances b or Z2+lc in the row. As regards the distance g g and so on of the rows from one another, transversely movable bars are required, which are perpendicular to the first-named bar and are capable of being changed. All these changes can, however, also be provided for without changing the bars, by the provision of displaceable stolgls on the bars.

Fig. 6 of the drawings a constructional exam le of the device is shown in plan view. Fig. is a section on line AB of Fig. 6, Fig. 8 is a side elevation of Fig. 6, and Fig. 9 a view of Fig. 6 seen in the direction of the arrow E. Figs. 10 and 11 show examples of the two bars with adjustable stops. Figs. 12 and 13 show the longitudinal bar with adjustable stops of a different kind in front elevation and plan view. Fig. 14 is a view of Fig. 13 seen in the direction of the arrow D. Fig. 15 is a cross-section on G-H of Fig. 13 to an enlarged scale. Figs. 16 and 17 show details. Fig. 18 shows a cutting device for the bridging pieces between the stampings in plan view. Fig. 19 is a sect on on J--KL of Fig. 18 and Fig. 20 a section on MM of Fig. 18. Fig. 21 is a vertical section showing how the cutters of the upper die operate, and Fig. 22 is a view in the direction of the arrow of Fig. 21.

The device according to Figs. 6-9 consists of a table 2 supported by supports 1, 1. The supports are supported either by the machine itself or rest on separate feet or brackets. The supports 1, 1 each support at either side by means of brackets 3, 3 a guide bar 4 for a slide 5. The two slides 5, are connected together by two bars 6, 6 which act as guides for a slide 7 The latter slide carries on a bar 8 two spring-loaded clamping devices 10, 11 for the sheet 12 to be stamped, which are jointly operated by a bar 9. The motion of the slide 7 in both lateral directions 13, 14 with respect to the stance of the worker at F can be imparted either by hand or automatically, for instance by weights, one of each of which is suspended from a rope or 16 which is guided over a pulley 17 or 18 journalled on the lateral slides 5, 5. That weight which is not required for the moment is put out of operation when in its bottom position by the respective rope being unhitched.

In front of the slide 7 a longitudinal bar 1.9 is guided in the slides 5, for instance by means of the slots (Fig. 9). This longitudinal bar enables the slide 7 and with it the sheet metal plate 12 to be stamped out to be advanced in the direction of the arrows 13, 14. For this purpose the bar is provided with counter-stops for a stop controlled by the machine. The stop consists for instance of a pin 21 which is guided vertically in a sleeve 22 supported by the slide 7 and is acted on on the one hand by a spring 23 which seeks to force it out and on the other hand by a Bowden wire 24 which seeks to pull it back, which wire leads to the end of a lever arm 26 pivoted at 25. A roller 27 on this lever is controlled by a cam 28 on a shaft 29 of the machine. The counter-stops on the bar 19, which cooperate with the stop 21 are for instance in the form of notches 30, the distance between which is for instance equal to Z) in Fig. 3, that is to say, the distance of the centres of two adjacent and contacting stamping patterns in the same row, or equal to 6 +10 in Fig. 4.

When notches are used, the distance between thesenotches can of course only correspond to a definite distance, for instance 6, so that in the case of another distance, for instance I) +70, the bar 19 must be changed for another bar having this distance between the notches.

In order to be able to displace the row 0 with respect tothe row (Z, for instance by the amount h or Z, according to Figs. 3 and 4 the bar 19 is made displaceable in both directions indicated by the arrows 13 and 14 by the amount 31 which can be adjusted for each particular case. This displacement is preferably limited by set screws 32 which are provided in angle pieces 33 fixed to the slides 5 and are accurately'adjustable to the amount required in each case.

For displacing the sheet metal plate 12 from the row (1 to the row 6 and so on by the distance required in each case, for instance 9 (Fig. 3) or 9 (Fig. 4), two transverse shifting bars 34 (Figs. 6 and 8) are provided at the sides of the table 2, which are capable of being adjusted and fixed in the angle pieces 3 and which are for instance made in the form of a kind of rack. The slides 5, 5 are displaceable alon three bars and can be fixed in the teeth of the same. lVith these teeth there coact two spring-controlled pawls 35 which are pivoted at 36, are connected by a transverse bar 37 and can be rocked togetherby means of the handles 38.

On one of the handles 38 being rocked over in the direction of the arrow in Fig. 8 the pawls 35 are lifted out of engagement with the teeth of the bars 34 and the slides 5, together with the stop bar 19, the slides 7 and the sheet metal plate 12 (Figs. 6 and 8) are displaced to the left by one tooth. This displacement is effected either through the whole device being arranged on an incline or pull weights are provided, the pull members 29 of which are attached to the slides 5, 5 and run for instance over pulleys 40 journalled on the rear brackets 3. After the handle 38 has been released, springs 41 cause the pawls 35 to engage with a tooth of the bar 34.

The distance between the teeth of the racks 34 corresponds to a definite distance of the rows (Z and e from one another, for instance 9 or 9 For any other distance the racks 34 must be changed for other racks, having teeth of a different pitch.

The described device is so arranged with respect to the punch itself, which will suitable be an ordinary stamp or drawing piess,tliat the lower die 42 when in the operative position lies approximately in the plane of the table 2 with. the upper die 43 above it (Figs. 6 and 7 The device consisting substantially of the table 2 and the bars 19 and 34 for advancing the slide 7 together with the sheet metal plate 12 can be either combined with an ordinary stamp or drawing press in a permanent or releasable manner and may be displaceable with respect to it or it may form a separate unit, in which case it must be capable of being moved into the stamp or drawing press. In the latter two cases the stamp or drawing press can be used in the on dinary way afterthe removal of the device. In the last-named case the device is fairly unaffected by the vibrations of the machine. Furthermore the machine is independent of the length and breadth of the sheet metal plate if the device is made of suitable dimensions.

The device operates in the following manner: Assuming the subdivision to be that shown in Fig. 3 a bar 19 having a distance equal to 1) between the notches is inserted.

The stop screws 32 are set for a lateral displacement of the bar 19 by'the amount h. Racks 34 having a pitch equal to g, are then inserted. If the first row is to be punched out in the direction of the arrow 13 the sheet metal plate 12 is so gripped in the clamps 10, 11 that the first pattern of the first row is in register with the bottom die 42 which with a sheet metal plate of a definite size can be accurately determined for this sheet y a lateral stop. The weights are then hung on to the pull members 15 and 39, 39. The stop 21 engages in a notch 30 of the bar 19 and the latter rests against the left hand stop 32 (as viewed by the worker standing in front of the table.) On the machine being started the first pattern is punched out. On the upper die rising the stop 21 is lifted out of the notch 30, the slide 7 together with the sheet metal plate 12 is moved to the left by the weighted pull member 15 and the stop member 21, which after being withdrawn is free to move, is brought by the action of the spring 23 in contact with the bar 19 so that it can drop into the next notch 30, whereupon the second pattern is stamped out in the same way. After the row d (Fig. 3) has been finished the slide together with the sheet metal plate 12 is moved through the pawls 35 being released by the amount g into the second row 6. By putting the pull member 15 out of operation and the pull member 16 into operation, the bar 19 shifts at 31 by the amount it to which it has been set and the punching out of this row can be completed.

Instead of using the weighted pull members 15 and 16 the slide 7 together with the sheet metal plate 12 can be advanced by hand in the same row of patterns,

notch 30 of the bar 19.

v n the stop member 21 also engaging automatically in the next cam being rocked by means of a handle 44 (Fig. 9) and be locked in this position for enabling the slide desired extent.

The bars 19 and 34, 34 may be so constructed that without the necessity of chang ing them they will be suitable for adjusting to any distances, that is to say, the bar 19 to any distance I) (Fig. 3) or 6+7: (Fig. 4) and the bars 34, 34 to any distance g, g g 9 For this purpose these bars are provided with accurately adjustable members.

In the constructional form shown in Figs. 10 and 11 the bars 19 and 34, 34 are in the form of screw spindles 19 (Fig. 10) and 34 (Fig. 11) having a thread of small pitch, along with nuts 45 are adjustable, whichcan be fixed in any desired position by lock nuts 48. The nuts and lock nuts are preferably made very low so that in the case of small distances they can be brought up very close. In Fig. 10 the preferably bevelled off double nut coacts with the controlled stop 21 as a counterstop in both directions and the screw spindle 10 is longitudinally displaceable as in the former case by a distance 31. In Fig. 11 the double nut acts as a stop for the pawl 35, one of the nuts 45 being preferably mounted so as to enable the slide 7 to slip over easily when being returned. The nuts may be eas ily set in an accurate manner by means of templates.

i It is known in the case of machines used for stamping out a single longitudinal row on long narrow work pieces or at the edge of a metal sheet, that is, where the work piece has to be moved in one direction only, to dis- 7 to be displaced to any place the stop members on one or two, parallel bars as required, for instance in the form of nuts along screw spindles, so that it is not necessary to change this bar or bars when the length of feed has to be changed.

The employment of this known arrangement for the present machine would only permit of the distance I) or b k and so on of the patterns from one another being changed in t e same row cl or e. In this case, however, it would not be possible to punch out the difierent patterns shown in Figs. 1 to 5, as the chan e in the distance g g 9 of the rows (1 and e from one another could not be effected in the manner as required by the invention.

For obtaining this effect, that is to say for punching out rows of patterns at any desired distance without changing the bars, according to the invention the arrangement which is known per se is provided both 'for the longitudinal bar 19 and for the transverse shift-- mg bars 34, 34.

In Figs. 6 and 7 an automatic device i shown, for cutting ed the bridging pieces which may be-left when a sheet metal plate is punched out. The lower die is provided with a straight cutting edge 47 with which a cutter connected to the movable upper die 43 eoacts at each punching operation. The pressure plate 50 mounted. on the guide of the upper die 43 and acted on by springs 49 forces the metal sheet down lightly during the punching and cutting off of the bridging iece. The stamped out blanks are blown y a strong blast supplied through the pipe 51 into a collecting vessel.

Figs. 12-17 show a new way of forming the stops for the forward feed at any desired distance, for instance on the longitudinal bar 19..

According to the invention the bar with the steps is composed by pieces of different length being placed next to one another and fixed on a common support. The longitudinal bar has in its upper part a cross-section which with the aid of making up pieces represents a groove 56 which is undercut at both sides (see more particularly Fig. The distance of the stops, for instance the notches from one another is determined by trapeziform pieces 57 of different lengths and thickness being placed next to one another (see more particularly Figs. 16 and 17), which pieces fit in the groove 56 in which they are fixed by locking the making up pieces by means of the pressure applying and fixing screws 58 and 59. For forming the notches 30 short and low pieces 60 are in serted which in one and the same machine are of the same size. The fineness. of the subdivision of the pieces 57 depends on the desired fineness in the grading of the size 6 of the punchings or the distance Z) or b In (Figs. 2, 3 and 4). As graduations of 1/254 of an inch are required, pieces 57 of this length (thickness) and multiples thereof should be provided. These pieces are pressed together in the longitudinal dirction, this being effected .by means of complementary wedge-shaped pieces 61, 62, the latter of which rests against an abutment 63 and after being fixed by means of a screw 64 exerts an axial pressure on the pieces or blocks arranged next to one another.

The longitudinal bar 19 thus composed is guided on slides 5 which are movable in transverse guides 4, for instance by means of the slots 20 and can therefore be displaced to the right and left by an amount 31 up to a stop, whereby the amount of offset Z (Fig. 4) of the rows cl and c with respect to one another is determined. This distance 31 is different for different sheet metal plates and may be different even for the same sheet metal plate.

In Figs. 12 and 13 the longitudinal bar 19 is combined with. an adjustable member which is provided with a number of adjustable stops so that by simply adjusting this number a differently set stop becomes operative.

In Figs. 1214 this member is a. rotatable disc 65 or the like, which has on its surface a number of axially displaceable stops in the form of screw pins (56, of which the pin lying in the direciion of the bar 19 acts as the stop. The pin can be fixed in the required position by nuts 67. As each pin facing the bar 19 is of a different length for altering the amount 31 of the displacement of the bar, it is only necessary to rotate the disc 54 for obtaining a change of this amount 31.

The disc 65 is rotatable on a sleeve 68 which suitably forms the nut for the threaded part 69 of a bar 6 which in the machine serves the purpose of guiding the slide for advancing the sheet metal plate. The nut can be fixed on the thread for instance by means of a screw 70 and the disc can be held in any of the effective positions automatically by a snap mechanism.

The cutting elf device shown in Figs. 1822 for the bridging pieces left when stamping out the sheet metal plate consists of two pairs of cutters 71, 72 and 73, 7 4 which are fixed to the table of the stamp or drawing press in such a manner by means of a V-shaped supporting part 75 that the pairs of cutters are at an inclination to the longitudinal advancing direction of the sheet metal plate 12, the sheet metal plate 12 being advanced on the table 2 in the direction of the arrows 13 and 14. Of each pair of cutters, the lower cutter 7 2 or 7 4 is fixed, while the upper cutter 71 or 7 3 pivots about a pin 77 or 78 and is held when the stamp or drawing press is out of operation in the open position by means of a spring 79 (Fig. 19). The two pairs of cutters operate in recesses 80 and 81 of the table 2.

The cutters are operated by the upper die. For this purpose on the rising and falling upper die 82 (Figs. 21 and 22) a pressure arm 83 is fixed at 84, 84 so as to be adjustable in the vertical direction, which pressure arm has its ends extendingbeyond the cross-section of the upper die and is provided at the places which come in contact with the upper cutters 71, 73 with pressure-applying knobs 85.

In Fig. 18 the stamp or drawing press is operative at 86 on the partly punched out sheet metal plate 12 and the sheet metal. plate is displaced in the direction of the arrow 83. From the upper die 82 shown in dot and dash lines it will be seen that at each downward motion of the same the pressure-applying knobs 85 will rock the cutters 71 and 7 3 downwards so that the pairs of cutters 71 and 72 and 7 3, 74 will cut ofi the bridging pieces left over from the previously stamped row at the places 90, 90 along an inclined line.

It will be seen that the pairs of cutters are so arranged that they cannot cut into the figure to be stamped out, which is for instance a circle, if this figure does not exceed a certain size. For this purpose the common support 75 is adjustable along slots 87.

It will also be seen that the two pairs of cutters come into operation on the first row only when the first and second left-hand figure of the second row is being punched, while subsequently only the pair of cutters 71, 72 is actually operative at each stamping pressure, as it is the forward pair in the feed ing motion of the sheet 12 in the direction of the arrow 13. The second pair of cutters 73, 74 will thus act idly, but will be effective as the front pair of the cutters when the sheet metal plate 12 is moved in the direction of the arrow 14.

The bridging pieces which are cut at each stamping pressure fall between the pairs of cutters in the direction of the arrow 88 (Fig. 19) into a container placed below them, for which reason the table 2 should be cutaway say at 89 between the two pairs of cutters.

The punched out and drawn blanks are conveyed from the place 86 by means of special guide walls, not shown, into a second container.

i/Vhat we claim is:

1. Feeding mechanism for stamp or drawing presses and the like for stamping out rows of patterns comprising a slide carrying the workpiece to be stamped, a guide for said slide, at least one second guide arranged perpendicularly to the first guide and adapted to serve as a guide for the first guide, dividing means arranged parallel to said guides and having stops adapted to secure the working positions of the slide along said guides, said stops being optionally adjustable along said dividing means, one of said dividing means which is arranged parallel to the guide of the slide being displaceable in its longitudinal direction in both directions, and means for displacing said dividing means by an optionally adjustable amount.

2. Feeding mechanism according to claim 1, in which the dividing means are built up by placing next to one another and fixing on a common support pieces of different length or different thickness.

8. Feeding mechanism according to claim 1, in which the dividing means are provided with undercut grooves for the receiving of pieces of different length or different thickness and further are provided with means for common pressing together said pieces in the longitudinal direction.

4. Feeding mechanism as claimed in claim 1, characterized by the feature that for displacing the dividing means in its longitudinal direction by an optionally adjustable amountan adjustable member having a number of adjustable stops is provided, so by merely displacing the said member a differently adjusted stop becomes operative.

5. Feeding mechanism as claimed in claim 1, characterized by the feature that the member for displacing the dividing means in its longitudinal direction by an optionally adjustable amount is a rotatable disc or the like, which bears on its surface a number of axially adjustable stops.

6. Feeding mechanism according to claim 1, in which the slide, the guides and dividing means are combined on a separable movable, suitably travelling, stand, and can, therefore, be brought up to an ordinary stamp or drawing press and be removable from it, in order that the stamp or drawing press may be used without the feeding device.

7. Feeding mechanism according to claim 1, in which the stops of one dividing means coact with a member united to the slide and controlled by the stamp or drawing press.

In witness whereof we have hereunto signed our names.

KARL STERN. J OSEF KUBIN. 

